Safe bolt work



(No Model.) 4Sheets-Sheet 1 F. H. BULLARD.

SAFE BOLT WORK. No. 486,817. Patented Nov. 22, 1892 (No Model.) 4 she'ets sheet 2,

- P. H. BULLARD.

SAFE BOLT WORK.

No. 486,817; Patented NOV; 22, 1892.

m: NORRIS PETERS ca. PHOTO-H7140 wnsnmmon o c (Nd Mo'de1.) I 4Sheets-Sheet 3. P. H. B-ULLARD.

SAFE BOL'T WORK.

No. 4 6,817. Patented Nov. 22,1892.

eddd x 4 sheets sheet 4.

- F. H. BULLARD.

SAFE BOL'LIWORK.

' Patented Nov; 22, 1892. I

Puo'raumu. wAsumcJoN, u. c.

(No Model.)

" UNITED STATES PATENT OFFICE.

FREDERICK HERBERT BULLARD, OF GHICOPEE, MASSACHUSETTS, ASSIGNOR TO THEYALE & TOWNENMANUFACTURING OOMPANY, OF STAMFORD,

CONNECTICUT.

SAFE-BOL'iI'WO R-K.I I

SPECIFICATION forming part of Letters Patent No. 486,817, dated November22,1892.

Application filed January 30, 1892- serial No. 419,769i (ITO model.) I

To all whom it may concern:

Be it known that I, FREDERICK HERBERT BULLARD, of Ohicopee, county ofHampden, and State of Massachusetts, have invented certain new anduseful Improvements in Bolt- Operating Devices, of which the followingis a specification, reference being had to the accompanying drawings.

The object of my invention is to produce an [0 improved bolt-operatingdevice'of the class in which the same operating power which casts theboltwork is alsoused for retracting it. In this class of bolt operatingdevices thev objection has heretofore existed that they have been soconstructed that to bring the parts into a position for retracting theboltwork it was necessary for said parts, in casting the boltwork, tomove through a certain distance, or, in other words, pass a dead-cenzoter before'the spring or weight of the other power could operate toretract the bolts. It is-obvious that this construction rendered theapparatus peculiarly liable to cause lockout, because if from imperfectadjustment or from 2 5 sticking of the parts or any other obstructionthe mechanism should fail to pass the deadcenter point it would beimpossible for the apparatus to retract the bolts. In my apparatus thisobjection is entirely obviated, be- 0 cause the center of motion orfulcrum for locking is quite distinct from the center of In ordermotionor fulcrum for unlocking. that the weight or spring may fullyoperate for unlocking, it is quite material through 5 .what distance theparts may move in the act of looking, so that in this particular mydevice has every advantage which is possessed by devices where the powerwhich casts the bolts is separate and distinct from the power whichretracts them. Another disadvantage in devices which have used the samepower for casting and retracting the boltwork has been that they haveusually employed the greatest power for casting the bolts instead ofretracting them, which reverses the proper conditions. I obviate thisobjection by using two difierent fulcrums, as above pointed out,

so that the casting power is lessthanthe-retracting, power under theoperation of the same motive po wer, whether a weight or spring or otherpower.

In the drawings I illustrate a weighted lever; but it is obvious that aspring mightbe employed inplace of it. Ialso use a cylinder in which .apiston works to relieve the shock. This piston may be either anair-piston or filled with fluid,:as preferred, and is of course notessential to the operation of my device at all.

V Figure 1 of the drawings is a top plan view safe or vault when thedoor has been shut and the boltwork automatically cast into thefasteningposition. Fig. 4 is a similar view, the parts being shown, in theposition they occupy when the time-lock has performed its ordinary workof releasing a catch and gravity has caused the weighted lever tofurther descend and retract the boltwork, thus automati: 1 Callyunfastening the door. Fig. 5 isa pjerspective view of the weighted leverdetached. Fig. 6 is a perspective view of a bar 0 detached i Fig. 7 is aperspective view of the bell-crank lever detached.

In the form of embodiment of my improv -r ments illustrated, theoperating power shown is a weight adjustable upon a lover; but that: isonly one example. Any other suitable power might housed. Referring tothe letters upon the drawings, A indicates a section of the door plateto which myimproved automatic bolt-operating apparatus is applied.

B indicates a section of an ordinary carryin g-bar for boltwork. l

O in Fig. 1 indicates a part of a bolt, and D indipates a time-lock.(Not illustrated in detail.

E indicates the ordinary pivoted catch of a time-lock adapted to beengaged with a movable part of the bolt-operating apparatus and to bemoved to one side by the operation of the time-lock at a predeterminedtime to disengage the movable part and release the boltoperatingmechanism, so that it can automatically perform its proper function.

F indicates a lug projecting from the carrying-bar, to which is pivotedone arm of a bell-crank lever G, pivoted again at H to the door-plateand pivoted again at I to one end of a lever K, which lever is pivotedat L and which carries an adjustable Weight M.

N indicates a cylinder, which with its piston and the fluid it containsconstitutes a cushion. The stem of the piston is pivoted at I, where theend of lever K and the bellcrank lever are also pivotally connected foroperation, so that whenever the free end of the lever descends by theoperation of its weight the fluid cushion operates to make its descentgradual and noiseless, so that no shock is produced.

0 indicates a bar pivotedat one end at H and at the other end at L andprovided with an upwardly-projecting hook P, adapted to engage with alever Q, pivoted at R and provided with a hook S and a projection T,against which the hook P strikes when raised to adjust the lever Q. Thelever Q is again pivoted at U in a slotVof a lever W, pivoted atX. Thislever W-is adapted to engage with the catch E of the time-lock in theusual way.

Y indicates a projection from the bar 0, extending over the pivoted endof the lever K and provided with a screw Z. This screw is adjustable upand down and forms a stop to limit the upward motion of the pivoted endof the lever K and other pivotally-connected parts. From thisconstruction it will be perceived that the lever K is provided with whatmay be called a shifting fulcrum, so that the lever itself by changingthe position of its fulcrum is converted from a lever of the first kindinto a lever of the second kind.

When the parts are in position, as shown in Fig. 2, the weight being atits highest point of elevation and the hooks P and S being engaged, thefulcrum of the lever K is at L, and the weight tends to raise the pistonof the fluid cushion and to turn the bell-crank lever on its pivot H andgradually cast the boltwork and fasten the door, when it will be inposition as shown in Fig. 3. In this position it will be observed thescrew-top Z has limited the upward movement of the pivoted end of thelever K, and also the upward movement of one end of the bell-cranklever, and has practically converted the bar 0 and the lever K into onecontinuous lever having its fulcrum at H. In this condition the weightof the lever would.tend to press down the piston and to operate thebell-crank lever so as to retract the boltwork; but it is prevented bythe engagement of hooks P and S, through which the weight of the leveris suspended. When, however, the time-lock disengages the catch E, thefulcrum of the lever being then at pivot H, the weight will descend,forcing the piston downward and operating the bellcrank lever to retractthe boltwork, which will-leave the parts all in the position asindicated in Fig. 4:.

I thus produce a simple and efficient boltoperating device in which thesame power is used for casting and retracting the boltwork, which hasall the certainty and'independence of action that is obtained by the useof independent casting and retracting powers and in which the failure ofthe parts to move a certain distance in looking will not in any wayinterfere with the retraction of the boltwork at the proper time.

WhatI claim is- 1. In an automatic bolt-operating device, thecombination of a power and boltwork witha lever K operated by the power,mechanism for operatively connecting the lever with the boltwork, and astop adapted to limit the movement of the lever for casting theboltwork, substantially as described.

2. In an automatic bolt-operating device, the combination of a power andboltwork with a lever and a bar 0, connected therewith and with theboltwork, and a stop by means of which the lever and bar are operativelyconnected as one lever, whereby a partial action of the power casts theboltwork and a further action of the power retracts the boltwork,substantially as described.

3. In an automatic bolt-operating device, the combination of a power andboltwork with a bell-crank lever adapted to be moved by the power in thedirection for casting the boltwork, and a'second lever with which thebellcrank lever engages, and a time-lock adapted to release the power,whereby the bell-crank lever will move in the direction for retractingthe boltwork, substantially as described.

at. In an automatic bolt-operating device, the combination, withboltwork, of a weighted lover, a bell-crank lever, and a stop over thepivoted connection of the two levers, whereby the fulcrum of theweighted lever is shifted when that lever has been partially operated,substantially as described.

5. In a bolt-operating apparatus, the combination of a bell-crank leverpivotally connected by one arm with the boltwork and pivotally connectedby the other arm with a weighted lever, and a bar connecting thelever-fulcrum pivot at L with the bell-crank lever-pivot at H, and astop, as at Z, whereby the fulcrum-pivot of the lever is shifted from Lto H, substantially as described.

6. In an automatic bolt-operating apparatus, the combination, with theboltwork and a time-lock, of a bell-crank lever G, a weighted lever K, abar 0, having a hook P, a lever Q, provided with a hook S and aprojection T; a slotted lever W, and a projection Y from the bar 0,provided with serew Z, all 10 arranged and operating substantially asdescribed.

In testimony whereof I have hereunto subscribed my name.

FREDERICK HERBERT BULLARD.

Witnesses: V

DANIEL M. KEY, FRANK HARRINGTON.-

